If the Pacific Ocean is shrinking (seafloor is disappearing) and the Atlantic Ocean is expanding (seafloor is being formed), the types of plate boundaries that must be involved in each location are A. Pacific Ocean, convergent; Atlantic Ocean, divergent. At convergent boundaries, denser land suducts beneath lighter land. In an ocean's case, the seafloor is always more dense than the continent it is colliding with. This means that the seafloor subducts beneath the continent and slowly travels back to the mantle. At divergent boundaries, volcanoes lining deep-sea trenches constantly erupt which forms land that moves onto each side of the trench thereby creating new seafloor.
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Robert Anderson was an American military officer who was born on 14th of June, 1805 and died in 1871.
He was significant to the Civil War because he was the Union commander during the very first battle of the war when the Confederate Army attacked.
